Every two years, the International Association for the Study of Pain publishes a compendium of benchmark papers that summarize the current status of pain research, treatment, and management throughout the world. Presented at the 15th World Congress on Pain in Buenos Aires in October 2014, these papers represent the thinking of the world's top pain scientists and clinicians. IASP distributes this book to participants in the Refresher Courses, and it is now available to pain researchers and clinicians who were unable to attend the Congress.